machine for rifling gun and pistol barrels



2 Sheets-Sheet 1; MAUSER MACHINE FOR RIFLINGGUN ,AND PISTOL BARRELS. No.259,031.

(No Model.)

Patented J une '6, 18 82.

Ill-F 2 Sheets-Sheet 2.

( No Model.)

P. MAUSBR. Y MACHINE FOR RIFLING GUN AND PISTOL BARRELS.

N0.259,031. Patented June 6, 1882.

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UNITED STATES PATENT OFFICE.

PAUL MAUSER, OF OBERNDORF-ON-THE-NEOKAR, WURTEMBERG, GERMANY.

MACHINE F OR RIFLING GUN AND PISTOL BARRELS.

SPEGIF'ICATIONformingpart of Letters Patent No. 259,031, dated June 6,1882, Application filed December 27, 1881. (No model.) Patented inGermany November 14, 1881.

To all whom it may concern Be it known that I, PAUL MAUSER, ofOberndorf-on-the-Neckar, Kingdom of Wiirtem berg, Germany, have inventedcertain new and useful Improvements in Machinery forRifling the Barrelsof Guns, Pistols, 860., of which the following is a specification.

The invention will be understood as set forth and claimed herein.

The accompanying drawings form a part of this specification andillustrate the invention.

Figure 1 is a front elevation, showing the essential parts of thedevice. Some of the parts are broken away to show others back of them.Fig. 2 is an end view, looking in the direction of the arrow in Fig. 1.Fig. 3 is a plan view of the device. Fig. 3 is a detail of the outer endof the rulerv and the link in which it may be adjusted. Fig. 4. shows atop and front view of the guide. Fig. 5 isavertical section of Fig. 2.Fig. 6 is a horizontal section of the device, taken through the'rearboltof the ruler. Fig. 7 shows a top view and horizontal section of theguide and pin -slide. Fig. 8 is a front elevation of the guide, havingthe slot-carryin g portion adjustable. Fig. 9 is a vertical section ofFig. 8. Fig. 10 is a horizontal section of,

the same, taken through the slot. Fig. 11 shows a modified form of themeans for elevating or depressing the ruler. Fig. 12 is averticalsection through the rear bolt of the form shown in Fig. 11.

Similar letters of reference indicate corresponding parts in all thefigures.

A is the ruler, and B the front link, up and down in which the ruler, isadjustable. A way or race is provided in the ruler in which thecutter-head carrying the cutting-tool works. These parts are common toall machines of this class, and I have not deemed it necessary toillustrate the cutter-head and cutting-tool;

The inclined position of the ruler A, as is well known in the art,causes the tool' to out a uniform screw-line in the gun-barrel. By meansof the adj ustability afforded by the link B the twist of the cuts maybe made smaller or larger; but during the rifling the ruler A hashitherto been kept stationary. To produce the tapering out, which is theobject of this invention, the ruler is moved. To accomplish this theruler A is raised and lowered uniformly and automatically by themechanism about to be described. The outer end of the ruler. A ispivoted to a boltwhich passes through the link B. The inner end isforked and straddles the block b, which turns on a bolt, a,.fixed to thelowerend of an upright guide, D. The guide D moves up and down in wayson a. fixed bracket,

, E. A piece of hard metal, 0, is placed in the upper part of the-guideD, and is provided with a slot,'c, set in an inclined position in thepiece '0. A horizontal slide, 0, moved in ways in the bracket F, isprovided with a. pin, d, which works in the slot 0 and produces areciprocating movement of the guide D as the slide a is moved back andforth. A bar, H, mounted in bearings g on the plate G, and actuated by acam on the main shaft of the machine, (not shown,) carries the tappetsff, which ship the slide 6 back and forth. The inner end of the ruler Ais thus elevated or depressed by the action of the tappets f f on theslide 6 operating upon the guide D by means of the pin d and slot 0.

Suppose the cutting-head to be making its backstroke-that is, travelingfrom the muzzle to the breech of thebarrel-and the ruler A to be in itselevated position, the out will be of uniform twist, as the positionof'the ruler is not changed during the stroke. After the cutter leavesthe barrel it travels about one and one-half inch farther. During thistime .the front tappet,f,-strikes the slide 0, forces it back, and thuslowers the inner end of the ruler A, and the cutting-head is therebyturned slightly. While the cut is being made in the reverse way (fromthe breech to the muzzle) the twist of the cut is shorter or narrowed,and gradually the two outs run into each other toward the muzzle,so thatthe cut at the breech, where the width of the two outs lies side byside, will be much broader than at the muzzle, where they merge intoeach other. The two outs taken together make one taperin gone, narrowerat the muzzle and broader at the breech. When the forward rifling isdone-4'. 6., the cutting from the breech to the muzzle-and while thecutting-tool is playing over the one and a half travel outside the endof the barrel, the tappetf ships the slide a, and the cuttinghead isturned to the position it first occupied.

1n the completed form of the inventionthe metal piece 0, withtheinclined slot c,is made so as to be capable of adjustment and changeof inclination, so that the elevation and depression of the ruler A willbe greater or less. This form is shown in Figs. 8, 9, and 10. The piece0 is here made a circular plate toothed upon its circumference. A worm,h, supported in hearings in the side'of the guide D, engages with theteeth on the piece 0. By turning the worm the piece 0 is revolved andtheinclination of the slot 0 is changer], so that the end oftherulerAwill be raised or lowered toa greater or less extent.

The modification shown in Figs. 11 and 12 shows the ruler A raised orlowered by resting on the wrist-pin i, which is set eccentric to thebolt a. The part D is formed into a forked lever embracing at itsbifurcated end the bar H, and is operated directly by the tappets ff. Atthe lower end of the lever the bolt (1 is secured to it and turned byit. The motion of this lever D is limited by a stop, it, working in aslot near the base. In this form the tappets ff, and also the stop k,are made adjustable. Hence this device will answer all the purposes ofthe adjustable form shown in Figs. 8, 9, and 10.

The device in any of its forms may be ap plied to wield rifling-machineof any form, as well as incorporated in a new machine.

Having thus described my invention, what I claim is 1.. The combination,with the ruler A, in which the cutter-head is held, of anautomatically-operated elevating and depressing means, D, attachedthereto, whereby one end of the ruler is elevated or depressed,substantially as set forth.

2. The combination of the ruler A and guide D, provided with theslot,c,of the slide a, pin d, and tappets f f, operated from the mainshaft of the riding-machine, substantially as set forth.

3. The combination, with the piece 0, having the slot 0 and adjustingmeans h, of the guide I), ruler A, and operating means, substantially asset forth.

This specification signed by me this 25th day of November, 1881.

PAUL MAUSER.

Vitnesses:

CARL T.BURCI1ARDT, BERTHOLD R01.

